Split rivet.



PATENTED JULY 30, 1907. E. B. STIMPSON.

SPLIT RIVET.

APPLICATION rILnn Nov. 1. 1906.

UNITED STATES EDWIN BALL STIMPSON, OF NEW YORK, N. Y.

SPLIT RIVE'I.

Specification of Letters Patent.

Patented July 30, 1907.

Application filed November 1,1906. Serial No. 341,563.

To all whom it may concern:

Be it known that I, EDWIN BALL SrIMrsoN, a citizen of the United States,residing in the borough of Brooklyn, county of Kings, city and StateofNew York, have invented certain new and useful Improvements in SplitRivets, of which the following is a specification.

This invention relates to the class of rivets made from solid metal asdistinguished from sheet-metal, the blank being formed by forging orpressing and afterward finished by milling or cutting.

The object of the present invention is to provide a split rivet madefrom a blank having a shank which tapers from its free end toward therivet-head, the said shank being split by milling or cutting to form twoclenching prongs. The prongs may be beveled or sharpened at their tipsin any of various ways, as shown in the accompanying drawings.

In these drawi'ngsFigure 1 shows the primary blank of the rivet, andFig. 2 shows the same after the prongs are formed by slitting the shank.Fig. 3 shows the rivet of Fig. 2 after the tips of the prongs have beenbeveled. Fig. 4 is an end view of the rivet shown in Fig. 3, and Fig. 5is a side view of the same taken at right-angles to the point of view ofFig. 3. Figs. 6 and 7 show different forms of the rivet, produced byvariations in the slitting and beveling. Figs. 8 and 9 are sectionalviews illustrating the use of the rivet in connection with an aperturedplate; and Fig. 10 is a similar view showing how it is set in a softmaterial without a plate.

Fig. 1 shows a rivet-blank formed by forging or the like, the blankhaving a head 1 and a shank 2, which latter is largest at its free endand tapers toward the head, with which it is integrally connected.

Fig. 2 shows the shank split by a slit 3, to form two prongs 4, 4. Inthis figure the slit is somewhat V- shaped, and the inner faces of theprongs are substantially parallel with their respective outer faces,so'that the prongs normally diverge from the head of the rivet to thetips of the prongs. After the slit 3 is producedpreferably by millingout the metalthe tips of the prongs may be beveled, as seen at 5 inFigs. 3, 4 and 5.

In Fig. 6 the slit 3 is shown as of uniform width, and in addition tothe bevels 5 on the prongs there are inner bevels 6.

In Fig. 7 the slit is the same as in Fig. 6, but the outer bevels areomitted and only inner bevels are employed on the prongs.

In Figs. 8, 9 and 10, P designates the plate, and G, the goods ormaterial inwhich the rivets are clenched.

The construction described provides a rivet with clenching prongs whichare normally strong and which are well adapted to stand the excessivewear to which they are commonly subjected in use, especially on belts.

It is not important to the present invention what form the head of therivet may be, or what size it may have; this will depend in a gooddegree on the use to which the rivet is to be put. The important featureis the taper of the shank which produces divergence of the clenchingprongs and thickness of the same at or near their outer ends. It will benoted the outer faces of the prongs diverge in all of the forms of therivet shown.

Having thus described my invention, I claim 1. A metal rivet, having ahead, and two clenching prongs which spring integrally therefrom theouter faces of said prongs diverging toward their tips, and thecrosssections of the prongs being greater near the outer ends of thesame than at their bases at the head of the rivet.

2. A metal rivet, having a head and two clenching prongs which springintegrally therefrom, the outer faces and edges of said prongs divergingtoward their tips, and the prongs being wider at their outer ends thanat their bases near the head.

3. A metal rivet, having a head and two clenching prongs, the outerfaces and edges of said prongs diverging toward their beveled tips andfrom the head, and said prongs being of uniform thickness from the headto their beveled tips and widest at their tips.

In witness whereof I have hereunto signed my name this 31st day of Oct.1906, in the presence of two sub scribing witnesses.

EDWIN BALL STIMPSON.

Witnesses:

H. G. HOSE, WILLIAM J. FIRTH.

